- If the instrument is not in “auto-calibration” mode (altitude or QNH has been set manually):

  1. enter the correct altitude or the QNH manually

  2. flag the option “continuous calibration by GPS”

  3. Let the GPS fix satellites and wait some minutes;

  4. Eventually switch the unit on again.

- If the instrument is in “auto-calibration” mode, let the GPS fix satellites and wait some minutes. - If the problem is not solved, switch off the device and turn it on again and wait till the GPS will fix satellites.

- If the problem is still not solved, enter manually the QNH or the Altitude and then repeat the same procedure described above (from point a) to point d)).